power consumption 45kW I thought turning up the voltage to achieve the specified kV/mm was what you meant by 'max value' in the example section.
Harry Michel Jullian wrote: > Better: area OK, but power still wrong. > > Michel > > ----- Original Message ----- > From: "Harry Veeder" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Monday, February 26, 2007 11:07 AM > Subject: Re: [Vo]: New multiwire-plane lifter design guide (was Re: lifter in > a accelerating frame) > > >> Michel Jullian wrote: >> >>> >>> Harry wrote: >>> >>>>> 100 kg thrust, 1 m gap, 0.9 kV/mm >>> ... >>>> Is this correct? >>>> >>>> power consumption 9 kW >>>> area 3.1 m^2 >>>> wire spacing 1.3m >>> >>> Only the wire spacing is correct, check your power and area calculations. >> >> >> power consumption 90 kW >> area 310 m^2 >> >> Harry >> >>>> Suggestions: >>>> Rephrase the scaling rules to read: >>>> >>>> "The W per g are proportional to the kV/mm, whereas the m^2 per g are >>>> proportional to the inverse square of the kV/mm." >>>> >>>> I would also explicitly show the mass in the calculation >>>> of the area in the example section. >>> >>> Thanks for the improvements, revised version: >>> ********************************************* >>> MULTIWIRE-PLANE LIFTER/IONOCRAFT DESIGN GUIDE: >>> -------- >>> Reference design: At 1 kV/mm (the max we can do without arcing) the power >>> consumption is 2 W per "gram" of thrust, and the required area is 0.0025 m^2 >>> per g. >>> >>> Scaling rules: The W per g are proportional to the kV/mm, whereas the m^2 >>> per >>> g are proportional to the inverse square of the kV/mm. >>> >>> Wire: as thin as possible (0.1mm OK in most cases), wire-wire spacing = 1.3 >>> times the gap length d (optimum value) >>> >>> EXAMPLE: >>> --------------- >>> We want to lift 50 g, and we choose a v/d of half the max value i.e. 0.5 >>> kV/mm, namely v=25kV for a d=50mm gap, to save on power consumption (our >>> color >>> monitor is only 75W) >>> >>> 1/ Required power per g: 2 W * 0.5 = 1 W -> Power consumption for 50 g = 50 >>> W >>> 2/ Required area per g: 0.0025 m^2 / 0.5^2 = 0.01 m^2 -> Area for 50 g = >>> 0.50 >>> m^2 >>> 3/ Wire-wire spacing: 1.3*50 mm = 65mm >>> >>> ********************************************* >>> -- >>> Michel
